Capacitance Addition Unit for Memory Card Noise Reduction
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Solution Overview
Problem
The exposed portion of memory cards in connectors can cause electromagnetic compatibility issues, leading to noise-related problems such as desense, RFI, and ESD, which affect the operation of devices and are difficult to mitigate using existing filtering technologies without compromising the convenience of insertion and removal.
Innovation Solution
An electronic component with a capacitance addition unit is positioned to face the exposed tip of the memory card, connected to the circuit board's ground, reducing noise radiation and reception by adding floating capacitance to the noise propagation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the memory card tip is exposed from the card mounting port for convenience of insertion and removal, then ease of operation is improved, but electromagnetic compatibility deteriorates causing noise emission and reception
Solution Approach 1:
A capacitance addition unit is introduced as an intermediary component between the memory card tip and the surrounding environment. This unit adds floating capacitance to the noise propagation circuit, effectively reducing both the emission and reception of electromagnetic noise while allowing the memory card tip to remain exposed for user convenience.
Solution Approach 2:
The electrical parameters of the noise propagation circuit are modified by adding floating capacitance through the capacitance addition unit. This changes the circuit's impedance characteristics and reduces the efficiency of noise radiation and reception, thereby improving electromagnetic compatibility without affecting the mechanical exposure of the memory card tip.
2Object-generated harmful factors
If a filter is provided on the wiring to reduce EMI, then electromagnetic compatibility is improved, but the operation of the memory card is affected
Solution Approach 1:
Instead of placing a filter directly in the signal path between the memory card and controller, a capacitance addition unit is used as an intermediary that reduces noise propagation through capacitive coupling. This approach mitigates electromagnetic interference without introducing the signal attenuation and operational issues associated with traditional filters.
Solution Approach 2:
The electrical characteristics of the noise propagation path are modified by adding floating capacitance, which changes the impedance and reduces noise transmission. This parameter change approach reduces EMI without the detrimental effects on memory card operation that result from inserting filters in the signal path.
3Object-generated harmful factors
If the memory card is completely enclosed to reduce noise, then electromagnetic compatibility is improved, but ease of operation deteriorates
Solution Approach 1:
A capacitance addition unit serves as an intermediary that reduces the memory card's sensitivity to external electromagnetic noise without requiring complete enclosure. The added floating capacitance effectively shields the card from noise while leaving the tip exposed for convenient user interaction.
Solution Approach 2:
The electrical parameters of the memory card interface are modified by adding floating capacitance, which reduces the card's antenna effect and susceptibility to external noise. This allows the memory card to remain partially exposed for ease of operation while achieving improved electromagnetic compatibility through parameter modification rather than physical enclosure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces noise emissions and receptions, maintaining device operation while allowing for convenient memory card insertion and removal.
Implementation Method 1
a capacitance addition unit provided at a position separated from and facing at least a part of the tip of the memory card... reducing noise radiation and reception by adding floating capacitance to the noise propagation circuit
Data Source
AI summary
An electronic member provided in a circuit board having a connector. The connector has a card mounting port and holds a memory card in a state where a tip of the memory card is exposed from the card mounting port at a connection position where a connection terminal of the memory card and a connection terminal of the circuit board are connected. The electronic component includes a device that adds capacitance at a position separated from and facing at least a part of the tip of the memory card, in a state where the memory card is held at the connection position by the connector, and a connector having first and second end portions in which the first end portion is connected to the device that adds capacitance and the second end portion is connected to a ground of the circuit board.